.NET library that adds, edits, and removes Annotations and markup — area and shape Annotations, text highlight/underline/strikeout, watermarks, image and link stamps, and threaded comments — on Pdf, Word, Excel, PowerPoint, images, CAD, Visio, and email files. No Microsoft Office or Adobe Acrobat required....Annotation Product Solution GroupDocs...GroupDocs.Annotation Product Family / GroupDocs.Annotation for .NET...